No ordinary Prime Minister, Johnson familiarly sent up in satire (7)

I believe the answer is:

lampoon

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'satire' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

(Other definitions for lampoon that I've seen before include "Ridicule with satire" , "Ridicule in writing or verse" , "Literary satire" , "Parody" , "Make fun of" .)

I've seen this clue in The Telegraph.

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